Hahn, M. W., Lang, E., Brandt, U., Wu, Q. L., & Scheuerl, T. (2009). Emended description of the genus Polynucleobacter and the species P. necessarius and proposal of two subspecies, P. necessarius subspecies necessarius subsp. nov. and P. necessarius subsp. a symbioticus subsp. nov.

Hahn, Martin W., Elke Lang, Ulrike Brandt, Qinglong L. Wu, و Thomas Scheuerl. Emended Description of the Genus Polynucleobacter and the Species P. Necessarius and Proposal of Two Subspecies, P. Necessarius Subspecies Necessarius Subsp. Nov. and P. Necessarius Subsp. a Symbioticus Subsp. Nov. 2009.

Hahn, Martin W., et al. Emended Description of the Genus Polynucleobacter and the Species P. Necessarius and Proposal of Two Subspecies, P. Necessarius Subspecies Necessarius Subsp. Nov. and P. Necessarius Subsp. a Symbioticus Subsp. Nov. 2009.